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   1 /***************************************************************************
   2  *   Copyright (C) 2005 by Dominic Rath                                    *
   3  *   Dominic.Rath@gmx.de                                                   *
   4  *                                                                         *
   5  *   This program is free software; you can redistribute it and/or modify  *
   6  *   it under the terms of the GNU General Public License as published by  *
   7  *   the Free Software Foundation; either version 2 of the License, or     *
   8  *   (at your option) any later version.                                   *
   9  *                                                                         *
  10  *   This program is distributed in the hope that it will be useful,       *
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  13  *   GNU General Public License for more details.                          *
  14  *                                                                         *
  15  *   You should have received a copy of the GNU General Public License     *
  16  *   along with this program; if not, write to the                         *
  17  *   Free Software Foundation, Inc.,                                       *
  18  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  19  ***************************************************************************/
  20 #ifdef HAVE_CONFIG_H
  21 #include "config.h"
  22 #endif
  23
  24 #include "replacements.h"
  25
  26 #include "gdb_server.h"
  27
  28 #include "server.h"
  29 #include "log.h"
  30 #include "binarybuffer.h"
  31 #include "jtag.h"
  32 #include "breakpoints.h"
  33 #include "flash.h"
  34 #include "target_request.h"
  35
  36 #include <string.h>
  37 #include <errno.h>
  38 #include <unistd.h>
  39 #include <stdlib.h>
  40
  41 #if 0
  42 #define _DEBUG_GDB_IO_
  43 #endif
  44
  45 static unsigned short gdb_port;
  46
  47 enum gdb_detach_mode
  48 {
  49         GDB_DETACH_RESUME,
  50         GDB_DETACH_RESET,
  51         GDB_DETACH_HALT,
  52         GDB_DETACH_NOTHING
  53 };
  54
  55 /* target behaviour on gdb detach */
  56 enum gdb_detach_mode detach_mode = GDB_DETACH_RESUME;
  57
  58 /* set if we are sending a memory map to gdb
  59  * via qXfer:memory-map:read packet */
  60 int gdb_use_memory_map = 0;
  61 int gdb_flash_program = 0;
  62
  63 int gdb_last_signal(target_t *target)
  64 {
  65         switch (target->debug_reason)
  66         {
  67                 case DBG_REASON_DBGRQ:
  68                         return 0x2; /* SIGINT */
  69                 case DBG_REASON_BREAKPOINT:
  70                 case DBG_REASON_WATCHPOINT:
  71                 case DBG_REASON_WPTANDBKPT:
  72                         return 0x05; /* SIGTRAP */
  73                 case DBG_REASON_SINGLESTEP:
  74                         return 0x05; /* SIGTRAP */
  75                 case DBG_REASON_NOTHALTED:
  76                         return 0x0; /* no signal... shouldn't happen */
  77                 default:
  78                         ERROR("BUG: undefined debug reason");
  79                         exit(-1);
  80         }
  81 }
  82
  83 int gdb_get_char(connection_t *connection, int* next_char)
  84 {
  85         gdb_connection_t *gdb_con = connection->priv;
  86
  87 #ifdef _DEBUG_GDB_IO_
  88         char *debug_buffer;
  89 #endif
  90
  91         if (gdb_con->buf_cnt-- > 0)
  92         {
  93                 *next_char = *(gdb_con->buf_p++);
  94                 if (gdb_con->buf_cnt > 0)
  95                         connection->input_pending = 1;
  96                 else
  97                         connection->input_pending = 0;
  98
  99 #ifdef _DEBUG_GDB_IO_
 100                 DEBUG("returned char '%c' (0x%2.2x)", *next_char, *next_char);
 101 #endif
 102
 103                 return ERROR_OK;
 104         }
 105
 106         while ((gdb_con->buf_cnt = read_socket(connection->fd, gdb_con->buffer, GDB_BUFFER_SIZE)) <= 0)
 107         {
 108                 if (gdb_con->buf_cnt == 0)
 109                         return ERROR_SERVER_REMOTE_CLOSED;
 110
 111 #ifdef _WIN32
 112                 errno = WSAGetLastError();
 113
 114                 switch(errno)
 115                 {
 116                         case WSAEWOULDBLOCK:
 117                                 usleep(1000);
 118                                 break;
 119                         case WSAECONNABORTED:
 120                                 return ERROR_SERVER_REMOTE_CLOSED;
 121                         case WSAECONNRESET:
 122                                 return ERROR_SERVER_REMOTE_CLOSED;
 123                         default:
 124                                 ERROR("read: %d", errno);
 125                                 exit(-1);
 126                 }
 127 #else
 128                 switch(errno)
 129                 {
 130                         case EAGAIN:
 131                                 usleep(1000);
 132                                 break;
 133                         case ECONNABORTED:
 134                                 return ERROR_SERVER_REMOTE_CLOSED;
 135                         case ECONNRESET:
 136                                 return ERROR_SERVER_REMOTE_CLOSED;
 137                         default:
 138                                 ERROR("read: %s", strerror(errno));
 139                                 exit(-1);
 140                 }
 141 #endif
 142         }
 143
 144 #ifdef _DEBUG_GDB_IO_
 145         debug_buffer = malloc(gdb_con->buf_cnt + 1);
 146         memcpy(debug_buffer, gdb_con->buffer, gdb_con->buf_cnt);
 147         debug_buffer[gdb_con->buf_cnt] = 0;
 148         DEBUG("received '%s'", debug_buffer);
 149         free(debug_buffer);
 150 #endif
 151
 152         gdb_con->buf_p = gdb_con->buffer;
 153         gdb_con->buf_cnt--;
 154         *next_char = *(gdb_con->buf_p++);
 155         if (gdb_con->buf_cnt > 0)
 156                 connection->input_pending = 1;
 157         else
 158                 connection->input_pending = 0;
 159 #ifdef _DEBUG_GDB_IO_
 160         DEBUG("returned char '%c' (0x%2.2x)", *next_char, *next_char);
 161 #endif
 162
 163         return ERROR_OK;
 164 }
 165
 166 int gdb_putback_char(connection_t *connection, int last_char)
 167 {
 168         gdb_connection_t *gdb_con = connection->priv;
 169
 170         if (gdb_con->buf_p > gdb_con->buffer)
 171         {
 172                 *(--gdb_con->buf_p) = last_char;
 173                 gdb_con->buf_cnt++;
 174         }
 175         else
 176         {
 177                 ERROR("BUG: couldn't put character back");
 178         }
 179
 180         return ERROR_OK;
 181 }
 182
 183 int gdb_put_packet(connection_t *connection, char *buffer, int len)
 184 {
 185         int i;
 186         unsigned char my_checksum = 0;
 187         char checksum[3];
 188 #ifdef _DEBUG_GDB_IO_
 189         char *debug_buffer;
 190 #endif
 191         int reply;
 192         int retval;
 193         gdb_connection_t *gdb_con = connection->priv;
 194
 195         for (i = 0; i < len; i++)
 196                 my_checksum += buffer[i];
 197
 198         while (1)
 199         {
 200 #ifdef _DEBUG_GDB_IO_
 201                 debug_buffer = malloc(len + 1);
 202                 memcpy(debug_buffer, buffer, len);
 203                 debug_buffer[len] = 0;
 204                 DEBUG("sending packet '$%s#%2.2x'", debug_buffer, my_checksum);
 205                 free(debug_buffer);
 206 #endif
 207                 write_socket(connection->fd, "$", 1);
 208                 if (len > 0)
 209                         write_socket(connection->fd, buffer, len);
 210                 write_socket(connection->fd, "#", 1);
 211
 212                 snprintf(checksum, 3, "%2.2x", my_checksum);
 213
 214                 write_socket(connection->fd, checksum, 2);
 215
 216                 if ((retval = gdb_get_char(connection, &reply)) != ERROR_OK)
 217                         return retval;
 218
 219                 if (reply == '+')
 220                         break;
 221                 else if (reply == '-')
 222                         WARNING("negative reply, retrying");
 223                 else if (reply == 0x3)
 224                 {
 225                         gdb_con->ctrl_c = 1;
 226                         if ((retval = gdb_get_char(connection, &reply)) != ERROR_OK)
 227                                 return retval;
 228                         if (reply == '+')
 229                                 break;
 230                         else if (reply == '-')
 231                                 WARNING("negative reply, retrying");
 232                         else
 233                         {
 234                                 ERROR("unknown character 0x%2.2x in reply, dropping connection", reply);
 235                                 return ERROR_SERVER_REMOTE_CLOSED;
 236                         }
 237                 }
 238                 else
 239                 {
 240                         ERROR("unknown character 0x%2.2x in reply, dropping connection", reply);
 241                         return ERROR_SERVER_REMOTE_CLOSED;
 242                 }
 243         }
 244
 245         return ERROR_OK;
 246 }
 247
 248 int gdb_get_packet(connection_t *connection, char *buffer, int *len)
 249 {
 250         int character;
 251         int count;
 252         int retval;
 253         char checksum[3];
 254         unsigned char my_checksum = 0;
 255         gdb_connection_t *gdb_con = connection->priv;
 256
 257         while (1)
 258         {
 259                 do
 260                 {
 261                         if ((retval = gdb_get_char(connection, &character)) != ERROR_OK)
 262                                 return retval;
 263
 264 #ifdef _DEBUG_GDB_IO_
 265                         DEBUG("character: '%c'", character);
 266 #endif
 267
 268                         switch (character)
 269                         {
 270                                 case '$':
 271                                         break;
 272                                 case '+':
 273                                         WARNING("acknowledgment received, but no packet pending");
 274                                         break;
 275                                 case '-':
 276                                         WARNING("negative acknowledgment, but no packet pending");
 277                                         break;
 278                                 case 0x3:
 279                                         gdb_con->ctrl_c = 1;
 280                                         *len = 0;
 281                                         return ERROR_OK;
 282                                 default:
 283                                         WARNING("ignoring character 0x%x", character);
 284                                         break;
 285                         }
 286                 } while (character != '$');
 287
 288                 my_checksum = 0;
 289                 count = 0;
 290
 291                 for (;;)
 292                 {
 293                         /* The common case is that we have an entire packet with no escape chars.
 294                          * We need to leave at least 2 bytes in the buffer to have
 295                          * gdb_get_char() update various bits and bobs correctly.
 296                          */
 297                         if ((gdb_con->buf_cnt > 2) && ((gdb_con->buf_cnt+count) < *len))
 298                         {
 299                                 /* The compiler will struggle a bit with constant propagation and
 300                                  * aliasing, so we help it by showing that these values do not
 301                                  * change inside the loop
 302                                  */
 303                                 int i;
 304                                 char *buf = gdb_con->buf_p;
 305                                 int run = gdb_con->buf_cnt - 2;
 306                                 i = 0;
 307                                 int done = 0;
 308                                 while (i < run)
 309                                 {
 310                                         character = *buf++;
 311                                         i++;
 312                                         if (character == '#')
 313                                         {
 314                                                 /* Danger! character can be '#' when esc is
 315                                                  * used so we need an explicit boolean for done here.
 316                                                  */
 317                                                 done = 1;
 318                                                 break;
 319                                         }
 320
 321                                         if (character == '}')
 322                                         {
 323                                                 /* data transmitted in binary mode (X packet)
 324                                                  * uses 0x7d as escape character */
 325                                                 my_checksum += character & 0xff;
 326                                                 character = *buf++;
 327                                                 i++;
 328                                                 my_checksum += character & 0xff;
 329                                                 buffer[count++] = (character ^ 0x20) & 0xff;
 330                                         } else
 331                                         {
 332                                                 my_checksum += character & 0xff;
 333                                                 buffer[count++] = character & 0xff;
 334                                         }
 335                                 }
 336                                 gdb_con->buf_p += i;
 337                                 gdb_con->buf_cnt -= i;
 338                                 if (done)
 339                                         break;
 340                         }
 341                         if (count > *len)
 342                         {
 343                                 ERROR("packet buffer too small");
 344                                 return ERROR_GDB_BUFFER_TOO_SMALL;
 345                         }
 346
 347                         if ((retval = gdb_get_char(connection, &character)) != ERROR_OK)
 348                                 return retval;
 349
 350                         if (character == '#')
 351                                 break;
 352
 353                         if (character == '}')
 354                         {
 355                                 /* data transmitted in binary mode (X packet)
 356                                  * uses 0x7d as escape character */
 357                                 my_checksum += character & 0xff;
 358                                 if ((retval = gdb_get_char(connection, &character)) != ERROR_OK)
 359                                         return retval;
 360                                 my_checksum += character & 0xff;
 361                                 buffer[count++] = (character ^ 0x20) & 0xff;
 362                         }
 363                         else
 364                         {
 365                                 my_checksum += character & 0xff;
 366                                 buffer[count++] = character & 0xff;
 367                         }
 368
 369                 }
 370
 371                 *len = count;
 372
 373                 if ((retval = gdb_get_char(connection, &character)) != ERROR_OK)
 374                         return retval;
 375                 checksum[0] = character;
 376                 if ((retval = gdb_get_char(connection, &character)) != ERROR_OK)
 377                         return retval;
 378                 checksum[1] = character;
 379                 checksum[2] = 0;
 380
 381                 if (my_checksum == strtoul(checksum, NULL, 16))
 382                 {
 383                         write_socket(connection->fd, "+", 1);
 384                         break;
 385                 }
 386
 387                 WARNING("checksum error, requesting retransmission");
 388                 write_socket(connection->fd, "-", 1);
 389         }
 390
 391         return ERROR_OK;
 392 }
 393
 394 int gdb_output(struct command_context_s *context, char* line)
 395 {
 396         connection_t *connection = context->output_handler_priv;
 397         gdb_connection_t *gdb_connection = connection->priv;
 398
 399         char *hex_buffer;
 400         int i, bin_size;
 401
 402         /* check if output is enabled */
 403         if (gdb_connection->output_disable)
 404         {
 405                 return ERROR_OK;
 406         }
 407
 408         bin_size = strlen(line);
 409
 410         hex_buffer = malloc(bin_size*2 + 4);
 411
 412         hex_buffer[0] = 'O';
 413         for (i=0; i<bin_size; i++)
 414                 snprintf(hex_buffer + 1 + i*2, 3, "%2.2x", line[i]);
 415         hex_buffer[bin_size*2+1] = '0';
 416         hex_buffer[bin_size*2+2] = 'a';
 417         hex_buffer[bin_size*2+3] = 0x0;
 418
 419         gdb_put_packet(connection, hex_buffer, bin_size*2 + 3);
 420
 421         free(hex_buffer);
 422         return ERROR_OK;
 423 }
 424
 425 int gdb_program_handler(struct target_s *target, enum target_event event, void *priv)
 426 {
 427         FILE *script;
 428         struct command_context_s *cmd_ctx = priv;
 429
 430         if (target->gdb_program_script)
 431         {
 432                 script = fopen(target->gdb_program_script, "r");
 433                 if (!script)
 434                 {
 435                         ERROR("couldn't open script file %s", target->gdb_program_script);
 436                                 return ERROR_OK;
 437                 }
 438
 439                 INFO("executing gdb_program script '%s'", target->gdb_program_script);
 440                 command_run_file(cmd_ctx, script, COMMAND_EXEC);
 441                 fclose(script);
 442
 443                 jtag_execute_queue();
 444         }
 445
 446         return ERROR_OK;
 447 }
 448
 449 int gdb_target_callback_event_handler(struct target_s *target, enum target_event event, void *priv)
 450 {
 451         connection_t *connection = priv;
 452         gdb_connection_t *gdb_connection = connection->priv;
 453         char sig_reply[4];
 454         int signal;
 455
 456         switch (event)
 457         {
 458                 case TARGET_EVENT_HALTED:
 459                         if (gdb_connection->frontend_state == TARGET_RUNNING)
 460                         {
 461                                 if (gdb_connection->ctrl_c)
 462                                 {
 463                                         signal = 0x2;
 464                                         gdb_connection->ctrl_c = 0;
 465                                 }
 466                                 else
 467                                 {
 468                                         signal = gdb_last_signal(target);
 469                                 }
 470
 471                                 snprintf(sig_reply, 4, "T%2.2x", signal);
 472                                 gdb_put_packet(connection, sig_reply, 3);
 473                                 gdb_connection->frontend_state = TARGET_HALTED;
 474                         }
 475                         break;
 476                 case TARGET_EVENT_RESUMED:
 477                         if (gdb_connection->frontend_state == TARGET_HALTED)
 478                         {
 479                                 gdb_connection->frontend_state = TARGET_RUNNING;
 480                         }
 481                         break;
 482                 case TARGET_EVENT_GDB_PROGRAM:
 483                         gdb_program_handler(target, event, connection->cmd_ctx);
 484                         break;
 485                 default:
 486                         break;
 487         }
 488
 489         return ERROR_OK;
 490 }
 491
 492 int gdb_new_connection(connection_t *connection)
 493 {
 494         gdb_connection_t *gdb_connection = malloc(sizeof(gdb_connection_t));
 495         gdb_service_t *gdb_service = connection->service->priv;
 496         int retval;
 497         int initial_ack;
 498
 499         connection->priv = gdb_connection;
 500
 501         /* initialize gdb connection information */
 502         gdb_connection->buf_p = gdb_connection->buffer;
 503         gdb_connection->buf_cnt = 0;
 504         gdb_connection->ctrl_c = 0;
 505         gdb_connection->frontend_state = TARGET_HALTED;
 506         gdb_connection->vflash_image = NULL;
 507         gdb_connection->output_disable = 0;
 508
 509         /* output goes through gdb connection */
 510         command_set_output_handler(connection->cmd_ctx, gdb_output, connection);
 511
 512         /* register callback to be informed about target events */
 513         target_register_event_callback(gdb_target_callback_event_handler, connection);
 514
 515         /* a gdb session just attached, put the target in halt mode */
 516         if (((retval = gdb_service->target->type->halt(gdb_service->target)) != ERROR_OK) &&
 517                         (retval != ERROR_TARGET_ALREADY_HALTED))
 518         {
 519                 ERROR("error when trying to halt target");
 520                 exit(-1);
 521         }
 522
 523         while (gdb_service->target->state != TARGET_HALTED)
 524         {
 525                 gdb_service->target->type->poll(gdb_service->target);
 526         }
 527
 528         /* remove the initial ACK from the incoming buffer */
 529         if ((retval = gdb_get_char(connection, &initial_ack)) != ERROR_OK)
 530                 return retval;
 531
 532         if (initial_ack != '+')
 533                 gdb_putback_char(connection, initial_ack);
 534
 535         return ERROR_OK;
 536 }
 537
 538 int gdb_connection_closed(connection_t *connection)
 539 {
 540         gdb_service_t *gdb_service = connection->service->priv;
 541         gdb_connection_t *gdb_connection = connection->priv;
 542
 543         /* see if an image built with vFlash commands is left */
 544         if (gdb_connection->vflash_image)
 545         {
 546                 image_close(gdb_connection->vflash_image);
 547                 free(gdb_connection->vflash_image);
 548                 gdb_connection->vflash_image = NULL;
 549         }
 550
 551         /* if this connection registered a debug-message receiver delete it */
 552         delete_debug_msg_receiver(connection->cmd_ctx, gdb_service->target);
 553
 554         if (connection->priv)
 555         {
 556                 free(connection->priv);
 557                 connection->priv = NULL;
 558         }
 559         else
 560         {
 561                 ERROR("BUG: connection->priv == NULL");
 562         }
 563
 564         target_unregister_event_callback(gdb_target_callback_event_handler, connection);
 565
 566         return ERROR_OK;
 567 }
 568
 569 void gdb_send_error(connection_t *connection, u8 the_error)
 570 {
 571         char err[4];
 572         snprintf(err, 4, "E%2.2X", the_error );
 573         gdb_put_packet(connection, err, 3);
 574 }
 575
 576 int gdb_last_signal_packet(connection_t *connection, target_t *target, char* packet, int packet_size)
 577 {
 578         char sig_reply[4];
 579         int signal;
 580
 581         signal = gdb_last_signal(target);
 582
 583         snprintf(sig_reply, 4, "S%2.2x", signal);
 584         gdb_put_packet(connection, sig_reply, 3);
 585
 586         return ERROR_OK;
 587 }
 588
 589 /* Convert register to string of bits. NB! The # of bits in the
 590  * register might be non-divisible by 8(a byte), in which
 591  * case an entire byte is shown. */
 592 void gdb_str_to_target(target_t *target, char *tstr, reg_t *reg)
 593 {
 594         static const char *DIGITS = "0123456789abcdef";
 595         int i;
 596
 597         u8 *buf;
 598         int buf_len;
 599         buf = reg->value;
 600         buf_len = CEIL(reg->size, 8);
 601
 602         if (target->endianness == TARGET_LITTLE_ENDIAN)
 603         {
 604                 for (i = 0; i < buf_len; i++)
 605                 {
 606                         tstr[i*2]   = DIGITS[(buf[i]>>4) & 0xf];
 607                         tstr[i*2+1] = DIGITS[buf[i]&0xf];
 608                 }
 609         }
 610         else
 611         {
 612                 for (i = 0; i < buf_len; i++)
 613                 {
 614                         tstr[(buf_len-1-i)*2]   = DIGITS[(buf[i]>>4)&0xf];
 615                         tstr[(buf_len-1-i)*2+1] = DIGITS[buf[i]&0xf];
 616                 }
 617         }
 618 }
 619
 620 void gdb_target_to_str(target_t *target, char *tstr, char *str)
 621 {
 622         int str_len = strlen(tstr);
 623         int i;
 624
 625         if (str_len % 2)
 626         {
 627                 ERROR("BUG: gdb value with uneven number of characters encountered");
 628                 exit(-1);
 629         }
 630
 631         if (target->endianness == TARGET_LITTLE_ENDIAN)
 632         {
 633                 for (i = 0; i < str_len; i+=2)
 634                 {
 635                         str[str_len - i - 1] = tstr[i + 1];
 636                         str[str_len - i - 2] = tstr[i];
 637                 }
 638         }
 639         else
 640         {
 641                 for (i = 0; i < str_len; i++)
 642                 {
 643                         str[i] = tstr[i];
 644                 }
 645         }
 646 }
 647
 648 int gdb_get_registers_packet(connection_t *connection, target_t *target, char* packet, int packet_size)
 649 {
 650         reg_t **reg_list;
 651         int reg_list_size;
 652         int retval;
 653         int reg_packet_size = 0;
 654         char *reg_packet;
 655         char *reg_packet_p;
 656         int i;
 657
 658 #ifdef _DEBUG_GDB_IO_
 659         DEBUG("-");
 660 #endif
 661
 662         if ((retval = target->type->get_gdb_reg_list(target, &reg_list, &reg_list_size)) != ERROR_OK)
 663         {
 664                 switch (retval)
 665                 {
 666                         case ERROR_TARGET_NOT_HALTED:
 667                                 ERROR("gdb requested registers but we're not halted, dropping connection");
 668                                 return ERROR_SERVER_REMOTE_CLOSED;
 669                         default:
 670                                 /* this is a bug condition - get_gdb_reg_list() may not return any other error */
 671                                 ERROR("BUG: unexpected error returned by get_gdb_reg_list()");
 672                                 exit(-1);
 673                 }
 674         }
 675
 676         for (i = 0; i < reg_list_size; i++)
 677         {
 678                 reg_packet_size += reg_list[i]->size;
 679         }
 680
 681         reg_packet = malloc(CEIL(reg_packet_size, 8) * 2);
 682         reg_packet_p = reg_packet;
 683
 684         for (i = 0; i < reg_list_size; i++)
 685         {
 686                 gdb_str_to_target(target, reg_packet_p, reg_list[i]);
 687                 reg_packet_p += CEIL(reg_list[i]->size, 8) * 2;
 688         }
 689
 690 #ifdef _DEBUG_GDB_IO_
 691         {
 692                 char *reg_packet_p;
 693                 reg_packet_p = strndup(reg_packet, CEIL(reg_packet_size, 8) * 2);
 694                 DEBUG("reg_packet: %s", reg_packet_p);
 695                 free(reg_packet_p);
 696         }
 697 #endif
 698
 699         gdb_put_packet(connection, reg_packet, CEIL(reg_packet_size, 8) * 2);
 700         free(reg_packet);
 701
 702         free(reg_list);
 703
 704         return ERROR_OK;
 705 }
 706
 707 int gdb_set_registers_packet(connection_t *connection, target_t *target, char *packet, int packet_size)
 708 {
 709         int i;
 710         reg_t **reg_list;
 711         int reg_list_size;
 712         int retval;
 713         char *packet_p;
 714
 715 #ifdef _DEBUG_GDB_IO_
 716         DEBUG("-");
 717 #endif
 718
 719         /* skip command character */
 720         packet++;
 721         packet_size--;
 722
 723         if (packet_size % 2)
 724         {
 725                 WARNING("GDB set_registers packet with uneven characters received, dropping connection");
 726                 return ERROR_SERVER_REMOTE_CLOSED;
 727         }
 728
 729         if ((retval = target->type->get_gdb_reg_list(target, &reg_list, &reg_list_size)) != ERROR_OK)
 730         {
 731                 switch (retval)
 732                 {
 733                         case ERROR_TARGET_NOT_HALTED:
 734                                 ERROR("gdb tried to registers but we're not halted, dropping connection");
 735                                 return ERROR_SERVER_REMOTE_CLOSED;
 736                         default:
 737                                 /* this is a bug condition - get_gdb_reg_list() may not return any other error */
 738                                 ERROR("BUG: unexpected error returned by get_gdb_reg_list()");
 739                                 exit(-1);
 740                 }
 741         }
 742
 743         packet_p = packet;
 744         for (i = 0; i < reg_list_size; i++)
 745         {
 746                 u8 *bin_buf;
 747                 char *hex_buf;
 748                 reg_arch_type_t *arch_type;
 749
 750                 /* convert from GDB-string (target-endian) to hex-string (big-endian) */
 751                 hex_buf = malloc(CEIL(reg_list[i]->size, 8) * 2);
 752                 gdb_target_to_str(target, packet_p, hex_buf);
 753
 754                 /* convert hex-string to binary buffer */
 755                 bin_buf = malloc(CEIL(reg_list[i]->size, 8));
 756                 str_to_buf(hex_buf, CEIL(reg_list[i]->size, 8) * 2, bin_buf, reg_list[i]->size, 16);
 757
 758                 /* get register arch_type, and call set method */
 759                 arch_type = register_get_arch_type(reg_list[i]->arch_type);
 760                 if (arch_type == NULL)
 761                 {
 762                         ERROR("BUG: encountered unregistered arch type");
 763                         exit(-1);
 764                 }
 765                 arch_type->set(reg_list[i], bin_buf);
 766
 767                 /* advance packet pointer */
 768                 packet_p += (CEIL(reg_list[i]->size, 8) * 2);
 769
 770                 free(bin_buf);
 771                 free(hex_buf);
 772         }
 773
 774         /* free reg_t *reg_list[] array allocated by get_gdb_reg_list */
 775         free(reg_list);
 776
 777         gdb_put_packet(connection, "OK", 2);
 778
 779         return ERROR_OK;
 780 }
 781
 782 int gdb_get_register_packet(connection_t *connection, target_t *target, char *packet, int packet_size)
 783 {
 784         char *reg_packet;
 785         int reg_num = strtoul(packet + 1, NULL, 16);
 786         reg_t **reg_list;
 787         int reg_list_size;
 788         int retval;
 789
 790 #ifdef _DEBUG_GDB_IO_
 791         DEBUG("-");
 792 #endif
 793
 794         if ((retval = target->type->get_gdb_reg_list(target, &reg_list, &reg_list_size)) != ERROR_OK)
 795         {
 796                 switch (retval)
 797                 {
 798                         case ERROR_TARGET_NOT_HALTED:
 799                                 ERROR("gdb requested registers but we're not halted, dropping connection");
 800                                 return ERROR_SERVER_REMOTE_CLOSED;
 801                         default:
 802                                 /* this is a bug condition - get_gdb_reg_list() may not return any other error */
 803                                 ERROR("BUG: unexpected error returned by get_gdb_reg_list()");
 804                                 exit(-1);
 805                 }
 806         }
 807
 808         if (reg_list_size <= reg_num)
 809         {
 810                 ERROR("gdb requested a non-existing register");
 811                 exit(-1);
 812         }
 813
 814         reg_packet = malloc(CEIL(reg_list[reg_num]->size, 8) * 2);
 815
 816         gdb_str_to_target(target, reg_packet, reg_list[reg_num]);
 817
 818         gdb_put_packet(connection, reg_packet, CEIL(reg_list[reg_num]->size, 8) * 2);
 819
 820         free(reg_list);
 821         free(reg_packet);
 822
 823         return ERROR_OK;
 824 }
 825
 826 int gdb_set_register_packet(connection_t *connection, target_t *target, char *packet, int packet_size)
 827 {
 828         char *separator;
 829         char *hex_buf;
 830         u8 *bin_buf;
 831         int reg_num = strtoul(packet + 1, &separator, 16);
 832         reg_t **reg_list;
 833         int reg_list_size;
 834         int retval;
 835         reg_arch_type_t *arch_type;
 836
 837         DEBUG("-");
 838
 839         if ((retval = target->type->get_gdb_reg_list(target, &reg_list, &reg_list_size)) != ERROR_OK)
 840         {
 841                 switch (retval)
 842                 {
 843                         case ERROR_TARGET_NOT_HALTED:
 844                                 ERROR("gdb tried to set a register but we're not halted, dropping connection");
 845                                 return ERROR_SERVER_REMOTE_CLOSED;
 846                         default:
 847                                 /* this is a bug condition - get_gdb_reg_list() may not return any other error */
 848                                 ERROR("BUG: unexpected error returned by get_gdb_reg_list()");
 849                                 exit(-1);
 850                 }
 851         }
 852
 853         if (reg_list_size < reg_num)
 854         {
 855                 ERROR("gdb requested a non-existing register");
 856                 return ERROR_SERVER_REMOTE_CLOSED;
 857         }
 858
 859         if (*separator != '=')
 860         {
 861                 ERROR("GDB 'set register packet', but no '=' following the register number");
 862                 return ERROR_SERVER_REMOTE_CLOSED;
 863         }
 864
 865         /* convert from GDB-string (target-endian) to hex-string (big-endian) */
 866         hex_buf = malloc(CEIL(reg_list[reg_num]->size, 8) * 2);
 867         gdb_target_to_str(target, separator + 1, hex_buf);
 868
 869         /* convert hex-string to binary buffer */
 870         bin_buf = malloc(CEIL(reg_list[reg_num]->size, 8));
 871         str_to_buf(hex_buf, CEIL(reg_list[reg_num]->size, 8) * 2, bin_buf, reg_list[reg_num]->size, 16);
 872
 873         /* get register arch_type, and call set method */
 874         arch_type = register_get_arch_type(reg_list[reg_num]->arch_type);
 875         if (arch_type == NULL)
 876         {
 877                 ERROR("BUG: encountered unregistered arch type");
 878                 exit(-1);
 879         }
 880         arch_type->set(reg_list[reg_num], bin_buf);
 881
 882         gdb_put_packet(connection, "OK", 2);
 883
 884         free(bin_buf);
 885         free(hex_buf);
 886         free(reg_list);
 887
 888         return ERROR_OK;
 889 }
 890
 891 int gdb_memory_packet_error(connection_t *connection, int retval)
 892 {
 893         switch (retval)
 894         {
 895                 case ERROR_TARGET_NOT_HALTED:
 896                         ERROR("gdb tried to read memory but we're not halted, dropping connection");
 897                         return ERROR_SERVER_REMOTE_CLOSED;
 898                         break;
 899                 case ERROR_TARGET_DATA_ABORT:
 900                         gdb_send_error(connection, EIO);
 901                         break;
 902                 case ERROR_TARGET_TRANSLATION_FAULT:
 903                         gdb_send_error(connection, EFAULT);
 904                         break;
 905                 case ERROR_TARGET_UNALIGNED_ACCESS:
 906                         gdb_send_error(connection, EFAULT);
 907                         break;
 908                 default:
 909                         ERROR("BUG: unexpected error %i", retval);
 910                         exit(-1);
 911         }
 912
 913         return ERROR_OK;
 914 }
 915
 916 int gdb_read_memory_packet(connection_t *connection, target_t *target, char *packet, int packet_size)
 917 {
 918         char *separator;
 919         u32 addr = 0;
 920         u32 len = 0;
 921
 922         u8 *buffer;
 923         char *hex_buffer;
 924
 925         int i;
 926         int retval;
 927
 928         /* skip command character */
 929         packet++;
 930
 931         addr = strtoul(packet, &separator, 16);
 932
 933         if (*separator != ',')
 934         {
 935                 ERROR("incomplete read memory packet received, dropping connection");
 936                 return ERROR_SERVER_REMOTE_CLOSED;
 937         }
 938
 939         len = strtoul(separator+1, NULL, 16);
 940
 941         buffer = malloc(len);
 942
 943         DEBUG("addr: 0x%8.8x, len: 0x%8.8x", addr, len);
 944
 945         switch (len)
 946         {
 947                 case 4:
 948                         if ((addr % 4) == 0)
 949                                 retval = target->type->read_memory(target, addr, 4, 1, buffer);
 950                         else
 951                                 retval = target->type->read_memory(target, addr, 1, len, buffer);
 952                         break;
 953                 case 2:
 954                         if ((addr % 2) == 0)
 955                                 retval = target->type->read_memory(target, addr, 2, 1, buffer);
 956                         else
 957                                 retval = target->type->read_memory(target, addr, 1, len, buffer);
 958                         break;
 959                 default:
 960                         if (((addr % 4) == 0) && ((len % 4) == 0))
 961                                 retval = target->type->read_memory(target, addr, 4, len / 4, buffer);
 962                         else
 963                                 retval = target->type->read_memory(target, addr, 1, len, buffer);
 964         }
 965
 966 #if 0
 967         if (retval == ERROR_TARGET_DATA_ABORT)
 968         {
 969                 /* TODO : Here we have to lie and send back all zero's lest stack traces won't work.
 970                  * At some point this might be fixed in GDB, in which case this code can be removed.
 971                  * http://sourceware.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gdb&pr=2395
 972                  */
 973                 memset(buffer, 0, len);
 974                 retval = ERROR_OK;
 975         }
 976 #endif
 977
 978         if (retval == ERROR_OK)
 979         {
 980                 hex_buffer = malloc(len * 2 + 1);
 981
 982                 for (i=0; i<len; i++)
 983                         snprintf(hex_buffer + 2*i, 3, "%2.2x", buffer[i]);
 984
 985                 gdb_put_packet(connection, hex_buffer, len * 2);
 986
 987                 free(hex_buffer);
 988         }
 989         else
 990         {
 991                 if ((retval = gdb_memory_packet_error(connection, retval)) != ERROR_OK)
 992                         return retval;
 993         }
 994
 995         free(buffer);
 996
 997         return ERROR_OK;
 998 }
 999
1000 int gdb_write_memory_packet(connection_t *connection, target_t *target, char *packet, int packet_size)
1001 {
1002         char *separator;
1003         u32 addr = 0;
1004         u32 len = 0;
1005
1006         u8 *buffer;
1007
1008         int i;
1009         int retval;
1010
1011         /* skip command character */
1012         packet++;
1013
1014         addr = strtoul(packet, &separator, 16);
1015
1016         if (*separator != ',')
1017         {
1018                 ERROR("incomplete write memory packet received, dropping connection");
1019                 return ERROR_SERVER_REMOTE_CLOSED;
1020         }
1021
1022         len = strtoul(separator+1, &separator, 16);
1023
1024         if (*(separator++) != ':')
1025         {
1026                 ERROR("incomplete write memory packet received, dropping connection");
1027                 return ERROR_SERVER_REMOTE_CLOSED;
1028         }
1029
1030         buffer = malloc(len);
1031
1032         DEBUG("addr: 0x%8.8x, len: 0x%8.8x", addr, len);
1033
1034         for (i=0; i<len; i++)
1035         {
1036                 u32 tmp;
1037                 sscanf(separator + 2*i, "%2x", &tmp);
1038                 buffer[i] = tmp;
1039         }
1040
1041         retval = ERROR_OK;
1042         switch (len)
1043         {
1044                 /* handle sized writes */
1045                 case 4:
1046                         if ((addr % 4) == 0)
1047                                 retval = target->type->write_memory(target, addr, 4, 1, buffer);
1048                         else
1049                                 retval = target->type->write_memory(target, addr, 1, len, buffer);
1050                         break;
1051                 case 2:
1052                         if ((addr % 2) == 0)
1053                                 retval = target->type->write_memory(target, addr, 2, 1, buffer);
1054                         else
1055                                 retval = target->type->write_memory(target, addr, 1, len, buffer);
1056                         break;
1057                 case 3:
1058                 case 1:
1059                         retval = target->type->write_memory(target, addr, 1, len, buffer);
1060                         break;
1061                         /* handle bulk writes */
1062                 default:
1063                         retval = target_write_buffer(target, addr, len, buffer);
1064                         break;
1065         }
1066
1067         if (retval == ERROR_OK)
1068         {
1069                 gdb_put_packet(connection, "OK", 2);
1070         }
1071         else
1072         {
1073                 if ((retval = gdb_memory_packet_error(connection, retval)) != ERROR_OK)
1074                         return retval;
1075         }
1076
1077         free(buffer);
1078
1079         return ERROR_OK;
1080 }
1081
1082 int gdb_write_memory_binary_packet(connection_t *connection, target_t *target, char *packet, int packet_size)
1083 {
1084         char *separator;
1085         u32 addr = 0;
1086         u32 len = 0;
1087
1088         u8 *buffer;
1089         int retval;
1090
1091         /* skip command character */
1092         packet++;
1093
1094         addr = strtoul(packet, &separator, 16);
1095
1096         if (*separator != ',')
1097         {
1098                 ERROR("incomplete write memory binary packet received, dropping connection");
1099                 return ERROR_SERVER_REMOTE_CLOSED;
1100         }
1101
1102         len = strtoul(separator+1, &separator, 16);
1103
1104         if (*(separator++) != ':')
1105         {
1106                 ERROR("incomplete write memory binary packet received, dropping connection");
1107                 return ERROR_SERVER_REMOTE_CLOSED;
1108         }
1109
1110         retval = ERROR_OK;
1111         if( len ) {
1112
1113                 buffer = malloc(len);
1114
1115                 DEBUG("addr: 0x%8.8x, len: 0x%8.8x", addr, len);
1116
1117                 memcpy( buffer, separator, len );
1118
1119                 switch (len)
1120                 {
1121                         case 4:
1122                                 if ((addr % 4) == 0)
1123                                         retval = target->type->write_memory(target, addr, 4, 1, buffer);
1124                                 else
1125                                         retval = target->type->write_memory(target, addr, 1, len, buffer);
1126                                 break;
1127                         case 2:
1128                                 if ((addr % 2) == 0)
1129                                         retval = target->type->write_memory(target, addr, 2, 1, buffer);
1130                                 else
1131                                         retval = target->type->write_memory(target, addr, 1, len, buffer);
1132                                 break;
1133                         case 3:
1134                         case 1:
1135                                 retval = target->type->write_memory(target, addr, 1, len, buffer);
1136                                 break;
1137                         default:
1138                                 retval = target_write_buffer(target, addr, len, buffer);
1139                                 break;
1140                 }
1141
1142                 free(buffer);
1143         }
1144
1145         if (retval == ERROR_OK)
1146         {
1147                 gdb_put_packet(connection, "OK", 2);
1148         }
1149         else
1150         {
1151                 if ((retval = gdb_memory_packet_error(connection, retval)) != ERROR_OK)
1152                         return retval;
1153         }
1154
1155         return ERROR_OK;
1156 }
1157
1158 void gdb_step_continue_packet(connection_t *connection, target_t *target, char *packet, int packet_size)
1159 {
1160         int current = 0;
1161         u32 address = 0x0;
1162
1163         DEBUG("-");
1164
1165         if (packet_size > 1)
1166         {
1167                 packet[packet_size] = 0;
1168                 address = strtoul(packet + 1, NULL, 16);
1169         }
1170         else
1171         {
1172                 current = 1;
1173         }
1174
1175         if (packet[0] == 'c')
1176         {
1177                 DEBUG("continue");
1178                 target->type->resume(target, current, address, 0, 0); /* resume at current address, don't handle breakpoints, not debugging */
1179         }
1180         else if (packet[0] == 's')
1181         {
1182                 DEBUG("step");
1183                 target->type->step(target, current, address, 0); /* step at current or address, don't handle breakpoints */
1184         }
1185 }
1186
1187 int gdb_bp_wp_packet_error(connection_t *connection, int retval)
1188 {
1189         switch (retval)
1190         {
1191                 case ERROR_TARGET_NOT_HALTED:
1192                         ERROR("gdb tried to set a breakpoint but we're not halted, dropping connection");
1193                         return ERROR_SERVER_REMOTE_CLOSED;
1194                         break;
1195                 case ERROR_TARGET_RESOURCE_NOT_AVAILABLE:
1196                         gdb_send_error(connection, EBUSY);
1197                         break;
1198                 default:
1199                         ERROR("BUG: unexpected error %i", retval);
1200                         exit(-1);
1201         }
1202
1203         return ERROR_OK;
1204 }
1205
1206 int gdb_breakpoint_watchpoint_packet(connection_t *connection, target_t *target, char *packet, int packet_size)
1207 {
1208         int type;
1209         enum breakpoint_type bp_type = BKPT_SOFT /* dummy init to avoid warning */;
1210         enum watchpoint_rw wp_type;
1211         u32 address;
1212         u32 size;
1213         char *separator;
1214         int retval;
1215
1216         DEBUG("-");
1217
1218         type = strtoul(packet + 1, &separator, 16);
1219
1220         if (type == 0)  /* memory breakpoint */
1221                 bp_type = BKPT_SOFT;
1222         else if (type == 1) /* hardware breakpoint */
1223                 bp_type = BKPT_HARD;
1224         else if (type == 2) /* write watchpoint */
1225                 wp_type = WPT_WRITE;
1226         else if (type == 3) /* read watchpoint */
1227                 wp_type = WPT_READ;
1228         else if (type == 4) /* access watchpoint */
1229                 wp_type = WPT_ACCESS;
1230
1231         if (*separator != ',')
1232         {
1233                 ERROR("incomplete breakpoint/watchpoint packet received, dropping connection");
1234                 return ERROR_SERVER_REMOTE_CLOSED;
1235         }
1236
1237         address = strtoul(separator+1, &separator, 16);
1238
1239         if (*separator != ',')
1240         {
1241                 ERROR("incomplete breakpoint/watchpoint packet received, dropping connection");
1242                 return ERROR_SERVER_REMOTE_CLOSED;
1243         }
1244
1245         size = strtoul(separator+1, &separator, 16);
1246
1247         switch (type)
1248         {
1249                 case 0:
1250                 case 1:
1251                         if (packet[0] == 'Z')
1252                         {
1253                                 if ((retval = breakpoint_add(target, address, size, bp_type)) != ERROR_OK)
1254                                 {
1255                                         if ((retval = gdb_bp_wp_packet_error(connection, retval)) != ERROR_OK)
1256                                                 return retval;
1257                                 }
1258                                 else
1259                                 {
1260                                         gdb_put_packet(connection, "OK", 2);
1261                                 }
1262                         }
1263                         else
1264                         {
1265                                 breakpoint_remove(target, address);
1266                                 gdb_put_packet(connection, "OK", 2);
1267                         }
1268                         break;
1269                 case 2:
1270                 case 3:
1271                 case 4:
1272                 {
1273                         if (packet[0] == 'Z')
1274                         {
1275                                 if ((retval = watchpoint_add(target, address, size, type-2, 0, 0xffffffffu)) != ERROR_OK)
1276                                 {
1277                                         if ((retval = gdb_bp_wp_packet_error(connection, retval)) != ERROR_OK)
1278                                                 return retval;
1279                                 }
1280                                 else
1281                                 {
1282                                         gdb_put_packet(connection, "OK", 2);
1283                                 }
1284                         }
1285                         else
1286                         {
1287                                 watchpoint_remove(target, address);
1288                                 gdb_put_packet(connection, "OK", 2);
1289                         }
1290                         break;
1291                 }
1292                 default:
1293                         break;
1294         }
1295
1296         return ERROR_OK;
1297 }
1298
1299 /* print out a string and allocate more space as needed, mainly used for XML at this point */
1300 void xml_printf(int *retval, char **xml, int *pos, int *size, const char *fmt, ...)
1301 {
1302         if (*retval != ERROR_OK)
1303         {
1304                 return;
1305         }
1306         int first = 1;
1307
1308         for (;;)
1309         {
1310                 if ((*xml == NULL) || (!first))
1311                 {
1312                         /* start by 0 to exercise all the code paths.
1313                          * Need minimum 2 bytes to fit 1 char and 0 terminator. */
1314
1315                         *size = *size * 2 + 2;
1316                         char *t = *xml;
1317                         *xml = realloc(*xml, *size);
1318                         if (*xml == NULL)
1319                         {
1320                                 if (t)
1321                                         free(t);
1322                                 *retval = ERROR_SERVER_REMOTE_CLOSED;
1323                                 return;
1324                         }
1325                 }
1326
1327             va_list ap;
1328             int ret;
1329             va_start(ap, fmt);
1330             ret = vsnprintf(*xml + *pos, *size - *pos, fmt, ap);
1331             va_end(ap);
1332             if ((ret > 0) && ((ret + 1) < *size - *pos))
1333             {
1334                 *pos += ret;
1335                 return;
1336             }
1337             /* there was just enough or not enough space, allocate more. */
1338             first = 0;
1339         }
1340 }
1341
1342 static int decode_xfer_read (char *buf, char **annex, int *ofs, unsigned int *len)
1343 {
1344         char *separator;
1345
1346         /* Extract and NUL-terminate the annex. */
1347         *annex = buf;
1348         while (*buf && *buf != ':')
1349                 buf++;
1350         if (*buf == '\0')
1351                 return -1;
1352         *buf++ = 0;
1353
1354         /* After the read marker and annex, qXfer looks like a
1355          * traditional 'm' packet. */
1356
1357         *ofs = strtoul(buf, &separator, 16);
1358
1359         if (*separator != ',')
1360                 return -1;
1361
1362         *len = strtoul(separator+1, NULL, 16);
1363
1364         return 0;
1365 }
1366
1367 int gdb_query_packet(connection_t *connection, target_t *target, char *packet, int packet_size)
1368 {
1369         command_context_t *cmd_ctx = connection->cmd_ctx;
1370
1371         if (strstr(packet, "qRcmd,"))
1372         {
1373                 if (packet_size > 6)
1374                 {
1375                         char *cmd;
1376                         int i;
1377                         cmd = malloc((packet_size - 6)/2 + 1);
1378                         for (i=0; i < (packet_size - 6)/2; i++)
1379                         {
1380                                 u32 tmp;
1381                                 sscanf(packet + 6 + 2*i, "%2x", &tmp);
1382                                 cmd[i] = tmp;
1383                         }
1384                         cmd[(packet_size - 6)/2] = 0x0;
1385                         target_call_timer_callbacks();
1386                         command_run_line(cmd_ctx, cmd);
1387                         free(cmd);
1388                 }
1389                 gdb_put_packet(connection, "OK", 2);
1390                 return ERROR_OK;
1391         }
1392         else if (strstr(packet, "qCRC:"))
1393         {
1394                 if (packet_size > 5)
1395                 {
1396                         int retval;
1397                         u8 gdb_reply[10];
1398                         char *separator;
1399                         u32 checksum;
1400                         u32 addr = 0;
1401                         u32 len = 0;
1402
1403                         /* skip command character */
1404                         packet += 5;
1405
1406                         addr = strtoul(packet, &separator, 16);
1407
1408                         if (*separator != ',')
1409                         {
1410                                 ERROR("incomplete read memory packet received, dropping connection");
1411                                 return ERROR_SERVER_REMOTE_CLOSED;
1412                         }
1413
1414                         len = strtoul(separator + 1, NULL, 16);
1415
1416                         retval = target_checksum_memory(target, addr, len, &checksum);
1417
1418                         if (retval == ERROR_OK)
1419                         {
1420                                 snprintf(gdb_reply, 10, "C%8.8x", checksum);
1421                                 gdb_put_packet(connection, gdb_reply, 9);
1422                         }
1423                         else
1424                         {
1425                                 if ((retval = gdb_memory_packet_error(connection, retval)) != ERROR_OK)
1426                                         return retval;
1427                         }
1428
1429                         return ERROR_OK;
1430                 }
1431         }
1432         else if (strstr(packet, "qSupported"))
1433         {
1434                 /* we currently support packet size and qXfer:memory-map:read (if enabled)
1435                  * disable qXfer:features:read for the moment */
1436                 int retval = ERROR_OK;
1437                 char *buffer = NULL;
1438                 int pos = 0;
1439                 int size = 0;
1440
1441                 xml_printf(&retval, &buffer, &pos, &size,
1442                                 "PacketSize=%x;qXfer:memory-map:read%c;qXfer:features:read-",
1443                                 (GDB_BUFFER_SIZE - 1), gdb_use_memory_map == 1 ? '+' : '-');
1444
1445                 if (retval != ERROR_OK)
1446                 {
1447                         gdb_send_error(connection, 01);
1448                         return ERROR_OK;
1449                 }
1450
1451                 gdb_put_packet(connection, buffer, strlen(buffer));
1452                 free(buffer);
1453
1454                 return ERROR_OK;
1455         }
1456         else if (strstr(packet, "qXfer:memory-map:read::"))
1457         {
1458                 /* We get away with only specifying flash here. Regions that are not
1459                  * specified are treated as if we provided no memory map(if not we
1460                  * could detect the holes and mark them as RAM).
1461                  * Normally we only execute this code once, but no big deal if we
1462                  * have to regenerate it a couple of times. */
1463
1464                 flash_bank_t *p;
1465                 char *xml = NULL;
1466                 int size = 0;
1467                 int pos = 0;
1468                 int retval = ERROR_OK;
1469
1470                 int offset;
1471                 int length;
1472                 char *separator;
1473
1474                 /* skip command character */
1475                 packet += 23;
1476
1477                 offset = strtoul(packet, &separator, 16);
1478                 length = strtoul(separator + 1, &separator, 16);
1479
1480                 xml_printf(&retval, &xml, &pos, &size, "<memory-map>\n");
1481
1482                 int i = 0;
1483                 for (;;)
1484                 {
1485                         p = get_flash_bank_by_num(i);
1486                         if (p == NULL)
1487                                 break;
1488
1489                         xml_printf(&retval, &xml, &pos, &size, "<memory type=\"flash\" start=\"0x%x\" length=\"0x%x\">\n" \
1490                                 "<property name=\"blocksize\">0x%x</property>\n" \
1491                                 "</memory>\n", \
1492                                 p->base, p->size, p->size/p->num_sectors);
1493                         i++;
1494                 }
1495
1496                 xml_printf(&retval, &xml, &pos, &size, "</memory-map>\n");
1497
1498                 if (retval != ERROR_OK)
1499                 {
1500                         gdb_send_error(connection, retval);
1501                         return retval;
1502                 }
1503
1504                 if (offset + length > pos)
1505                 {
1506                         length = pos - offset;
1507                 }
1508
1509                 char *t = malloc(length + 1);
1510                 t[0] = 'l';
1511                 memcpy(t + 1, xml + offset, length);
1512                 gdb_put_packet(connection, t, length + 1);
1513
1514                 free(t);
1515                 free(xml);
1516                 return ERROR_OK;
1517         }
1518         else if (strstr(packet, "qXfer:features:read:"))
1519         {
1520                 char *xml = NULL;
1521                 int size = 0;
1522                 int pos = 0;
1523                 int retval = ERROR_OK;
1524
1525                 int offset;
1526                 int length;
1527                 char *annex;
1528
1529                 /* skip command character */
1530                 packet += 20;
1531
1532                 if (decode_xfer_read( packet, &annex, &offset, &length ) < 0)
1533                 {
1534                         gdb_send_error(connection, 01);
1535                         return ERROR_OK;
1536                 }
1537
1538                 if (strcmp(annex, "target.xml") != 0)
1539                 {
1540                         gdb_send_error(connection, 01);
1541                         return ERROR_OK;
1542                 }
1543
1544                 xml_printf(&retval, &xml, &pos, &size, \
1545                         "l<target version=\"1.0\">\n<architecture>arm</architecture>\n</target>\n");
1546
1547                 if (retval != ERROR_OK)
1548                 {
1549                         gdb_send_error(connection, retval);
1550                         return retval;
1551                 }
1552
1553                 gdb_put_packet(connection, xml, strlen(xml) + 1);
1554
1555                 free(xml);
1556                 return ERROR_OK;
1557         }
1558
1559         gdb_put_packet(connection, "", 0);
1560         return ERROR_OK;
1561 }
1562
1563 int gdb_v_packet(connection_t *connection, target_t *target, char *packet, int packet_size)
1564 {
1565         gdb_connection_t *gdb_connection = connection->priv;
1566         gdb_service_t *gdb_service = connection->service->priv;
1567         int result;
1568
1569         /* if flash programming disabled - send a empty reply */
1570
1571         if (gdb_flash_program == 0)
1572         {
1573                 gdb_put_packet(connection, "", 0);
1574                 return ERROR_OK;
1575         }
1576
1577         if (strstr(packet, "vFlashErase:"))
1578         {
1579                 unsigned long addr;
1580                 unsigned long length;
1581
1582                 char *parse = packet + 12;
1583                 if (*parse == '\0')
1584                 {
1585                         ERROR("incomplete vFlashErase packet received, dropping connection");
1586                         return ERROR_SERVER_REMOTE_CLOSED;
1587                 }
1588
1589                 addr = strtoul(parse, &parse, 16);
1590
1591                 if (*(parse++) != ',' || *parse == '\0')
1592                 {
1593                         ERROR("incomplete vFlashErase packet received, dropping connection");
1594                         return ERROR_SERVER_REMOTE_CLOSED;
1595                 }
1596
1597                 length = strtoul(parse, &parse, 16);
1598
1599                 if (*parse != '\0')
1600                 {
1601                         ERROR("incomplete vFlashErase packet received, dropping connection");
1602                         return ERROR_SERVER_REMOTE_CLOSED;
1603                 }
1604
1605                 /* disable gdb output while programming */
1606                 gdb_connection->output_disable = 1;
1607
1608                 /* assume all sectors need erasing - stops any problems
1609                  * when flash_write is called multiple times */
1610                 flash_set_dirty();
1611
1612                 /* perform any target specific operations before the erase */
1613                 target_call_event_callbacks(gdb_service->target, TARGET_EVENT_GDB_PROGRAM);
1614
1615                 /* perform erase */
1616                 if ((result = flash_erase_address_range(gdb_service->target, addr, length)) != ERROR_OK)
1617                 {
1618                         /* GDB doesn't evaluate the actual error number returned,
1619                          * treat a failed erase as an I/O error
1620                          */
1621                         gdb_send_error(connection, EIO);
1622                         ERROR("flash_erase returned %i", result);
1623                 }
1624                 else
1625                         gdb_put_packet(connection, "OK", 2);
1626
1627                 /* reenable gdb output */
1628                 gdb_connection->output_disable = 0;
1629
1630                 return ERROR_OK;
1631         }
1632
1633         if (strstr(packet, "vFlashWrite:"))
1634         {
1635                 unsigned long addr;
1636                 unsigned long length;
1637                 char *parse = packet + 12;
1638
1639                 if (*parse == '\0')
1640                 {
1641                         ERROR("incomplete vFlashErase packet received, dropping connection");
1642                         return ERROR_SERVER_REMOTE_CLOSED;
1643                 }
1644                 addr = strtoul(parse, &parse, 16);
1645                 if (*(parse++) != ':')
1646                 {
1647                         ERROR("incomplete vFlashErase packet received, dropping connection");
1648                         return ERROR_SERVER_REMOTE_CLOSED;
1649                 }
1650                 length = packet_size - (parse - packet);
1651
1652                 /* disable gdb output while programming */
1653                 gdb_connection->output_disable = 1;
1654
1655                 /* create a new image if there isn't already one */
1656                 if (gdb_connection->vflash_image == NULL)
1657                 {
1658                         gdb_connection->vflash_image = malloc(sizeof(image_t));
1659                         image_open(gdb_connection->vflash_image, "", "build");
1660                 }
1661
1662                 /* create new section with content from packet buffer */
1663                 image_add_section(gdb_connection->vflash_image, addr, length, 0x0, (u8*)parse);
1664
1665                 gdb_put_packet(connection, "OK", 2);
1666
1667                 /* reenable gdb output */
1668                 gdb_connection->output_disable = 0;
1669
1670                 return ERROR_OK;
1671         }
1672
1673         if (!strcmp(packet, "vFlashDone"))
1674         {
1675                 u32 written;
1676                 char *error_str;
1677
1678                 /* disable gdb output while programming */
1679                 gdb_connection->output_disable = 1;
1680
1681                 /* process the flashing buffer. No need to erase as GDB
1682                  * always issues a vFlashErase first. */
1683                 if ((result = flash_write(gdb_service->target, gdb_connection->vflash_image, &written, &error_str, NULL, 0)) != ERROR_OK)
1684                 {
1685                         if (result == ERROR_FLASH_DST_OUT_OF_BANK)
1686                                 gdb_put_packet(connection, "E.memtype", 9);
1687                         else
1688                                 gdb_send_error(connection, EIO);
1689
1690                         if (error_str)
1691                         {
1692                                 ERROR("flash writing failed: %s", error_str);
1693                                 free(error_str);
1694                         }
1695                 }
1696                 else
1697                 {
1698                         DEBUG("wrote %u bytes from vFlash image to flash", written);
1699                         gdb_put_packet(connection, "OK", 2);
1700                 }
1701
1702                 image_close(gdb_connection->vflash_image);
1703                 free(gdb_connection->vflash_image);
1704                 gdb_connection->vflash_image = NULL;
1705
1706                 /* reenable gdb output */
1707                 gdb_connection->output_disable = 0;
1708
1709                 return ERROR_OK;
1710         }
1711
1712         gdb_put_packet(connection, "", 0);
1713         return ERROR_OK;
1714 }
1715
1716 int gdb_detach(connection_t *connection, target_t *target)
1717 {
1718         switch( detach_mode )
1719         {
1720                 case GDB_DETACH_RESUME:
1721                         target->type->resume(target, 1, 0, 1, 0);
1722                         break;
1723
1724                 case GDB_DETACH_RESET:
1725                         target_process_reset(connection->cmd_ctx);
1726                         break;
1727
1728                 case GDB_DETACH_HALT:
1729                         target->type->halt(target);
1730                         break;
1731
1732                 case GDB_DETACH_NOTHING:
1733                         break;
1734         }
1735
1736         gdb_put_packet(connection, "OK", 2);
1737
1738         return ERROR_OK;
1739 }
1740
1741 int gdb_input(connection_t *connection)
1742 {
1743         gdb_service_t *gdb_service = connection->service->priv;
1744         target_t *target = gdb_service->target;
1745         char packet[GDB_BUFFER_SIZE];
1746         int packet_size;
1747         int retval;
1748         gdb_connection_t *gdb_con = connection->priv;
1749         static int extended_protocol = 0;
1750
1751         /* drain input buffer */
1752         do
1753         {
1754                 packet_size = GDB_BUFFER_SIZE-1;
1755                 if ((retval = gdb_get_packet(connection, packet, &packet_size)) != ERROR_OK)
1756                 {
1757                         switch (retval)
1758                         {
1759                                 case ERROR_GDB_BUFFER_TOO_SMALL:
1760                                         ERROR("BUG: buffer supplied for gdb packet was too small");
1761                                         exit(-1);
1762                                 case ERROR_SERVER_REMOTE_CLOSED:
1763                                         return ERROR_SERVER_REMOTE_CLOSED;
1764                                 default:
1765                                         ERROR("BUG: unexpected error");
1766                                         exit(-1);
1767                         }
1768                 }
1769
1770                 /* terminate with zero */
1771                 packet[packet_size] = 0;
1772
1773                 DEBUG("received packet: '%s'", packet);
1774
1775                 if (packet_size > 0)
1776                 {
1777                         retval = ERROR_OK;
1778                         switch (packet[0])
1779                         {
1780                                 case 'H':
1781                                         /* Hct... -- set thread
1782                                          * we don't have threads, send empty reply */
1783                                         gdb_put_packet(connection, NULL, 0);
1784                                         break;
1785                                 case 'q':
1786                                         retval = gdb_query_packet(connection, target, packet, packet_size);
1787                                         break;
1788                                 case 'g':
1789                                         retval = gdb_get_registers_packet(connection, target, packet, packet_size);
1790                                         break;
1791                                 case 'G':
1792                                         retval = gdb_set_registers_packet(connection, target, packet, packet_size);
1793                                         break;
1794                                 case 'p':
1795                                         retval = gdb_get_register_packet(connection, target, packet, packet_size);
1796                                         break;
1797                                 case 'P':
1798                                         retval = gdb_set_register_packet(connection, target, packet, packet_size);
1799                                         break;
1800                                 case 'm':
1801                                         retval = gdb_read_memory_packet(connection, target, packet, packet_size);
1802                                         break;
1803                                 case 'M':
1804                                         retval = gdb_write_memory_packet(connection, target, packet, packet_size);
1805                                         break;
1806                                 case 'z':
1807                                 case 'Z':
1808                                         retval = gdb_breakpoint_watchpoint_packet(connection, target, packet, packet_size);
1809                                         break;
1810                                 case '?':
1811                                         gdb_last_signal_packet(connection, target, packet, packet_size);
1812                                         break;
1813                                 case 'c':
1814                                 case 's':
1815                                         gdb_step_continue_packet(connection, target, packet, packet_size);
1816                                         break;
1817                                 case 'v':
1818                                         retval = gdb_v_packet(connection, target, packet, packet_size);
1819                                         break;
1820                                 case 'D':
1821                                         retval = gdb_detach(connection, target);
1822                                         extended_protocol = 0;
1823                                         break;
1824                                 case 'X':
1825                                         if ((retval = gdb_write_memory_binary_packet(connection, target, packet, packet_size)) != ERROR_OK)
1826                                                 return retval;
1827                                         break;
1828                                 case 'k':
1829                                         if (extended_protocol != 0)
1830                                                 break;
1831                                         gdb_put_packet(connection, "OK", 2);
1832                                         return ERROR_SERVER_REMOTE_CLOSED;
1833                                 case '!':
1834                                         /* handle extended remote protocol */
1835                                         extended_protocol = 1;
1836                                         gdb_put_packet(connection, "OK", 2);
1837                                         break;
1838                                 case 'R':
1839                                         /* handle extended restart packet */
1840                                         target_process_reset(connection->cmd_ctx);
1841                                         break;
1842                                 default:
1843                                         /* ignore unkown packets */
1844                                         DEBUG("ignoring 0x%2.2x packet", packet[0]);
1845                                         gdb_put_packet(connection, NULL, 0);
1846                                         break;
1847                         }
1848
1849                         /* if a packet handler returned an error, exit input loop */
1850                         if (retval != ERROR_OK)
1851                                 return retval;
1852                 }
1853
1854                 if (gdb_con->ctrl_c)
1855                 {
1856                         if (target->state == TARGET_RUNNING)
1857                         {
1858                                 target->type->halt(target);
1859                                 gdb_con->ctrl_c = 0;
1860                         }
1861                 }
1862
1863         } while (gdb_con->buf_cnt > 0);
1864
1865         return ERROR_OK;
1866 }
1867
1868 int gdb_init()
1869 {
1870         gdb_service_t *gdb_service;
1871         target_t *target = targets;
1872         int i = 0;
1873
1874         if (!target)
1875         {
1876                 WARNING("no gdb ports allocated as no target has been specified");
1877                 return ERROR_OK;
1878         }
1879
1880         if (gdb_port == 0)
1881         {
1882                 WARNING("no gdb port specified, using default port 3333");
1883                 gdb_port = 3333;
1884         }
1885
1886         while (target)
1887         {
1888                 char service_name[8];
1889
1890                 snprintf(service_name, 8, "gdb-%2.2i", i);
1891
1892                 gdb_service = malloc(sizeof(gdb_service_t));
1893                 gdb_service->target = target;
1894
1895                 add_service("gdb", CONNECTION_GDB, gdb_port + i, 1, gdb_new_connection, gdb_input, gdb_connection_closed, gdb_service);
1896
1897                 DEBUG("gdb service for target %s at port %i", target->type->name, gdb_port + i);
1898
1899                 i++;
1900                 target = target->next;
1901         }
1902
1903         return ERROR_OK;
1904 }
1905
1906 /* daemon configuration command gdb_port */
1907 int handle_gdb_port_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
1908 {
1909         if (argc == 0)
1910                 return ERROR_OK;
1911
1912         /* only if the port wasn't overwritten by cmdline */
1913         if (gdb_port == 0)
1914                 gdb_port = strtoul(args[0], NULL, 0);
1915
1916         return ERROR_OK;
1917 }
1918
1919 int handle_gdb_detach_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
1920 {
1921         if (argc == 1)
1922         {
1923                 if (strcmp(args[0], "resume") == 0)
1924                 {
1925                         detach_mode = GDB_DETACH_RESUME;
1926                         return ERROR_OK;
1927                 }
1928                 else if (strcmp(args[0], "reset") == 0)
1929                 {
1930                         detach_mode = GDB_DETACH_RESET;
1931                         return ERROR_OK;
1932                 }
1933                 else if (strcmp(args[0], "halt") == 0)
1934                 {
1935                         detach_mode = GDB_DETACH_HALT;
1936                         return ERROR_OK;
1937                 }
1938                 else if (strcmp(args[0], "nothing") == 0)
1939                 {
1940                         detach_mode = GDB_DETACH_NOTHING;
1941                         return ERROR_OK;
1942                 }
1943         }
1944
1945         WARNING("invalid gdb_detach configuration directive: %s", args[0]);
1946         return ERROR_OK;
1947 }
1948
1949 int handle_gdb_memory_map_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
1950 {
1951         if (argc == 1)
1952         {
1953                 if (strcmp(args[0], "enable") == 0)
1954                 {
1955                         gdb_use_memory_map = 1;
1956                         return ERROR_OK;
1957                 }
1958                 else if (strcmp(args[0], "disable") == 0)
1959                 {
1960                         gdb_use_memory_map = 0;
1961                         return ERROR_OK;
1962                 }
1963         }
1964
1965         WARNING("invalid gdb_memory_map configuration directive: %s", args[0]);
1966         return ERROR_OK;
1967 }
1968
1969 int handle_gdb_flash_program_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
1970 {
1971         if (argc == 1)
1972         {
1973                 if (strcmp(args[0], "enable") == 0)
1974                 {
1975                         gdb_flash_program = 1;
1976                         return ERROR_OK;
1977                 }
1978                 else if (strcmp(args[0], "disable") == 0)
1979                 {
1980                         gdb_flash_program = 0;
1981                         return ERROR_OK;
1982                 }
1983         }
1984
1985         WARNING("invalid gdb_memory_map configuration directive: %s", args[0]);
1986         return ERROR_OK;
1987 }
1988
1989 int gdb_register_commands(command_context_t *command_context)
1990 {
1991         register_command(command_context, NULL, "gdb_port", handle_gdb_port_command,
1992                         COMMAND_CONFIG, "");
1993         register_command(command_context, NULL, "gdb_detach", handle_gdb_detach_command,
1994                         COMMAND_CONFIG, "");
1995         register_command(command_context, NULL, "gdb_memory_map", handle_gdb_memory_map_command,
1996                         COMMAND_CONFIG, "");
1997         register_command(command_context, NULL, "gdb_flash_program", handle_gdb_flash_program_command,
1998                         COMMAND_CONFIG, "");
1999         return ERROR_OK;
2000 }